package com.zbangmall.util.common;

import org.apache.log4j.Logger;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Properties;

/**
 * 配置相关的一些辅助类
 */
public class ConfigUtil {

	private static Logger logger = Logger.getLogger(ConfigUtil.class);

	/**
	 * 获取配置文件资源
	 *
	 * @return
	 */
	public static URL findAsResource(final String path) {
		URL url = null;

		ClassLoader contextClassLoader = ClassUtil.getContextClassLoader();
		if (contextClassLoader != null) {
			url = contextClassLoader.getResource(path);
		}
		if (url != null) {
			return url;
		}

		url = ConfigUtil.class.getClassLoader().getResource(path);
		if (url != null) {
			return url;
		}

		url = ClassLoader.getSystemClassLoader().getResource(path);

		return url;
	}

	/**
	 * @param path
	 * @return
	 */
	public static String resourcePath(final String path) {
		URL asResource = findAsResource(path);
		return new File(asResource.getFile()).getPath();
	}


	private static InputStream getConfigStream(final String path) throws RuntimeException {
		try {
			URL url = new URL(path);
			return url.openStream();
		} catch (IOException e) {
			throw new RuntimeException("Unable to open config file: " + path);
		}
	}

	/**
	 * 获取资源流
	 *
	 * @param path
	 * @return
	 * @throws IOException
	 */
	private static InputStream resourceStream(final String path) throws IOException {
		URL asResource = findAsResource(path);
		return asResource.openStream();
	}

	/**
	 * 获取资源属性
	 *
	 * @param path
	 * @return
	 * @throws IOException
	 */
	public static Properties getConfigProperties(String path) throws IOException {
		Properties properties = new Properties();
		properties.load(resourceStream(path));
		return properties;
	}


}
